Meaning: 成功を祈る、頑張って
For Example:
‣ Wow, you have a calculus exam next week? Break a leg!
わぁ、来週微積分学の試験あるん？頑張って！
‣ " Break a leg!" I shouted out to my son before he rushed in for his job interview.
「頑張ってきーまいよ！」と就職面接に急いで向かう息子に私は大声で呼びかけた。
Synonym:
Good luck!
Fingers crossed.